To provide a structure of preventing adhered water from dropping into a trunk room of an automobile to prevent adhered water such as rain water and the like flowing along the inner edge of a trunk lid from dropping into a trunk room when the trunk lid is opened.

A hinge cap 20 is provided with an inclined surface to guide adhered water to flow down along the inner edge of a trunk lid 5 to the outside of the car body when the trunk lid 5 is opened. The hinge cap 20 is installed on a fitting edge 10a in the trunk lid side of a trunk lid hinge arm 10. And also, a protector 30 provided with an inclined surface to guide adhered water to flow down along the trunk lid hinge arm 10 to the outside of the car body is installed on the middle part 10b of the trunk lid hinge arm 10.